<template>
  <div :class="className" :style="{height:height,width:width}" />
</template>

<script>
import echarts from "echarts";
require("echarts/theme/macarons"); // echarts theme
import resize from "./mixins/resize";

const animationDuration = 6000;

export default {
  mixins: [resize],
  props: {
    cdata: {
      type: Object,
      default: () => ({})
    },
    className: {
      type: String,
      default: "chart"
    },
    width: {
      type: String,
      default: "100%"
    },
    height: {
      type: String,
      default: "300px"
    }
  },
  data() {
    return {
      chart: null,
      options: {}
    };
  },
  // 监听cdata异步加载
  watch: {
    cdata: {
      handler(newData) {
        // 设置option
        this.setOpt(newData);
        // 重新渲染， true是清除旧数据
        this.chart.setOption(this.options, true);
      },
      deep: true
    }
  },
  mounted() {
    this.initChart();
  },
  beforeDestroy() {
    if (!this.chart) {
      return;
    }
    this.chart.dispose();
    this.chart = null;
  },
  methods: {
    // 初始化echart
    initChart() {
      this.chart = echarts.init(this.$el, "macarons");
      this.chart.setOption(this.options, true);
    },
    // 设置option
    setOpt(newData) {
      this.options = {
        tooltip: {
          trigger: "axis",
          axisPointer: {
            // 坐标轴指示器，坐标轴触发有效
            type: "shadow" // 默认为直线，可选为：'line' | 'shadow'
          }
        },
        grid: {
          top: 10,
          left: "2%",
          right: "2%",
          bottom: "3%",
          containLabel: true
        },
        xAxis: [
          {
            type: "category",
            data: newData.xData,
            axisTick: {
              alignWithLabel: true
            }
          }
        ],
        yAxis: [
          {
            type: "value",
            axisTick: {
              show: false
            }
          }
        ],
        series: [
          {
            name: newData.seriesName,
            type: "bar",
            stack: "vistors",
            barWidth: "60%",
            data: newData.seriesData,
            animationDuration
          }
        ]
      };
    }
  }
};
</script>
